JP2013217173A - Underwater tsunami buffer mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an operation with high reliability by design well utilizing power of nature.SOLUTION: (1) A structure is formed into a woven mat shape by connecting a light material such as bamboo with a strong fiber cord 2. One end of the fiber cord 2 is connected to a metal fitting buried at a sea bottom, and the structure in the woven mat shape is spread in a wall state in the sea by the buoyancy thereof. (2) Since each structure cannot be so large due to limitation of a length of the material or the like, when widely protecting a coastline, a plurality of structures are installed and they are installed in a plurality of layers in a zigzag shape with respect to the coastline. (3) As a main function of buffering the power of waves of tsunami or the like, the structure consumes the power of waves rushing onto the land by being sunk deep in the sea by the waves, and as another function, reduces the power toward the land for the gravity force of surfacing water by turning the advancing direction of a wave motion upwards.

Description

It relates to a mechanism that is installed to buffer the power of waves from the sea, such as tsunamis and high waves.

Until now, tsunami protection breakwaters were mainly fixed types using concrete with reinforcing bars, which were large-scale and had huge material and construction costs. Further, the movable type that has been invented so far is operated by a complicated device by installing an air chamber or the like, and the material cost and the construction cost increase, and the reliability is not necessarily high.

Patent Publication 2010-101097

To reduce enormous material and construction costs for fixed breakwaters. Avoid complicated ingenuity and operations required for other movable breakwaters, and ensure that operations can be performed with high reliability by using natural power.

In order not to transmit the power of tsunami to the coastal area as much as possible, we considered buffering the wave as upstream as possible in the coastal area, that is, in the water. It is a material that floats on the water, and it stands up in the water with its buoyancy to buffer tsunamis and other waves. If possible, we considered using a material with space inside, such as bamboo, and using it as a buffer for the transmission of tsunami waves when the water was taken into it. From these points, we have devised a mechanism that works effectively and functions sufficiently as a tsunami buffer mechanism.

In the present invention, since light and environmentally friendly materials such as bamboo are mainly used, inexpensive material costs and construction costs are sufficient. This mechanism is centered on the floating body, and is installed in the form of a wall in the water. The force of the wave that pushes away is dispersed into the force that moves the floating body and the force that lifts the water, thereby buffering and reducing the power of the tsunami.
In addition, it acts as a resistance against a pulling wave, and helps to reduce disasters.

FIG. 1 is a structural diagram of a structure (underwater wave barrier) according to the present invention. FIG. 2 is an installation view of the present invention. FIG. 3 is an installation assumption diagram for protecting a coastal facility from a tsunami according to the present invention. FIG. 4 is a diagram showing an operation when buffering a tsunami according to the present invention.

The structure is made in a cocoon shape by joining light materials such as bamboo together with a strong fiber string (such as cocoons). By connecting with three or more fiber strings, etc., it will continue to function even if one is broken. The lower end of the fiber cord is connected to a metal fitting embedded in the sea floor, and the ridge-like structure is spread in a wall state in the sea by its buoyancy. One structure is 5-10m long, and when it spreads into the sea, the height is about 3-5m longer than the depth of the sea. Consider increasing and sustaining the effect. (See Fig. 1 and Fig. 2)
Individual structures cannot be made very large due to limitations such as the length of the material. Therefore, it is assumed that a plurality of structures are installed when the coastline is widely protected.
Actually, as shown in FIG. 3, a plurality of layers are installed in a staggered pattern on the coastline.
The main function of the structure to buffer the power of waves such as tsunami is performed by the following two points.
One point is that the floating body, which is a structural body, is submerged deeply into the sea by waves, thereby consuming the force that pushes the waves toward the land, and the other point is that the direction of wave movement is directed upward, The gravitational force of the floating water also reduces the power to go to land. See FIG.

1. 1. Floating body: 5-10m long rod or column structure made of light material such as bamboo. Fiber string: A string mainly composed of fibers connecting many floating bodies. 2. Strong and strong against seawater Anchor bracket: A bracket that supports the entire structure by tying fiber strings. It is embedded in the sea floor, and when the tsunami hits, the whole wave barrier is strong enough not to lose the wave.

Claims (4)

It is a submerged tsunami buffer mechanism that uses light materials for the structure and spreads it in the state of the wall in the seawater by its buoyancy, and plays a role in reducing the power of the tsunami that has come. The main structure is made of light materials such as rods connected to each other with a strong fiber string in a bowl shape, and one end of the fiber string is connected to an anchor fitting embedded in the sea floor, forming a wall shape in the sea. By standing up, when a tsunami or the like rushes, when the wave passes through this structure, it has a function to buffer the power toward the land. If the structure is made of bamboo and other materials with a space inside, and seawater can be taken in, the seawater, including the seawater, can be moved to the bottom of the sea, further absorbing the power of waves. The structure should have a bowl-like structure with gaps as much as possible to facilitate the dispersion of wave forces and to reduce material costs. The structure is in a form that maintains an upright state in seawater, and has a buffering effect against a pulling wave.

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